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annotate lib/DebugInfo/DWARFAbbreviationDeclaration.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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1 //===-- DWARFAbbreviationDeclaration.cpp ----------------------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "DWARFAbbreviationDeclaration.h"
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11 #include "llvm/Support/Dwarf.h"
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12 #include "llvm/Support/Format.h"
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13 #include "llvm/Support/raw_ostream.h"
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14 using namespace llvm;
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15 using namespace dwarf;
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16
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17 void DWARFAbbreviationDeclaration::clear() {
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18 Code = 0;
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19 Tag = 0;
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20 HasChildren = false;
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21 Attributes.clear();
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22 }
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23
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24 DWARFAbbreviationDeclaration::DWARFAbbreviationDeclaration() {
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25 clear();
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26 }
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27
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28 bool
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29 DWARFAbbreviationDeclaration::extract(DataExtractor Data, uint32_t* OffsetPtr) {
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30 clear();
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31 Code = Data.getULEB128(OffsetPtr);
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32 if (Code == 0) {
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33 return false;
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34 }
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35 Tag = Data.getULEB128(OffsetPtr);
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36 uint8_t ChildrenByte = Data.getU8(OffsetPtr);
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37 HasChildren = (ChildrenByte == DW_CHILDREN_yes);
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38
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39 while (true) {
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40 uint32_t CurOffset = *OffsetPtr;
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41 uint16_t Attr = Data.getULEB128(OffsetPtr);
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42 if (CurOffset == *OffsetPtr) {
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43 clear();
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44 return false;
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45 }
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46 CurOffset = *OffsetPtr;
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47 uint16_t Form = Data.getULEB128(OffsetPtr);
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48 if (CurOffset == *OffsetPtr) {
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49 clear();
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50 return false;
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51 }
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52 if (Attr == 0 && Form == 0)
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53 break;
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54 Attributes.push_back(AttributeSpec(Attr, Form));
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55 }
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56
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57 if (Tag == 0) {
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58 clear();
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59 return false;
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60 }
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61 return true;
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62 }
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63
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64 void DWARFAbbreviationDeclaration::dump(raw_ostream &OS) const {
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65 const char *tagString = TagString(getTag());
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66 OS << '[' << getCode() << "] ";
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67 if (tagString)
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68 OS << tagString;
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69 else
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70 OS << format("DW_TAG_Unknown_%x", getTag());
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71 OS << "\tDW_CHILDREN_" << (hasChildren() ? "yes" : "no") << '\n';
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72 for (unsigned i = 0, e = Attributes.size(); i != e; ++i) {
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73 OS << '\t';
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74 const char *attrString = AttributeString(Attributes[i].Attr);
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75 if (attrString)
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76 OS << attrString;
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77 else
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78 OS << format("DW_AT_Unknown_%x", Attributes[i].Attr);
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79 OS << '\t';
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80 const char *formString = FormEncodingString(Attributes[i].Form);
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81 if (formString)
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82 OS << formString;
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83 else
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84 OS << format("DW_FORM_Unknown_%x", Attributes[i].Form);
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85 OS << '\n';
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86 }
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87 OS << '\n';
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88 }
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89
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90 uint32_t
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91 DWARFAbbreviationDeclaration::findAttributeIndex(uint16_t attr) const {
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92 for (uint32_t i = 0, e = Attributes.size(); i != e; ++i) {
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93 if (Attributes[i].Attr == attr)
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94 return i;
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95 }
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96 return -1U;
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97 }